ox {MethComp} | R Documentation |
Measurement of oxygen saturation in blood
Description
61 children had their blood oxygen content measured at the Children's
Hospital in Melbourne, either with a chemical method analysing gases in the
blood (CO
) or by a pulse oximeter measuring transcutaneously
(pulse
). Replicates are linked between methods; i.e. replicate 1 for
each of the two methods are done at the same time. However, replicate
measurements were taken in quick succession so the pairs of measurements are
exchangeable within person.
Format
A data frame with 354 observations on the following 4 variables.
meth
Measurement methods, factor with levels
CO
,pulse
item
Id for the child
repl
Replicate of measurements. There were 3 measurements for most children, 4 had only 2 replicates with each method, one only 1
y
Oxygen saturation in percent.
Examples
data(ox)
str(ox)
ox <- Meth(ox)
with( ox, table(table(item)) )
summary( ox )
# The effect of basing LoA on means over replicates:
par( mfrow=c(1,2), mar=c(4,4,1,4) )
BA.plot( ox , diflim=c(-20,20), axlim=c(20,100), repl.conn=TRUE )
# BA.plot( mean(ox), diflim=c(-20,20), axlim=c(20,100) )
[Package MethComp version 1.30.0 Index]